Improvement in machines for cutting off pipe



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NrrEn STATES .PATENT OFFICE.

CHARLES T. LITOHFI'ELD, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN MACHINES'FOR CUTTING OFF PIPE.

Specificationforming part of ALetters Patent No. 156,581, dated November 3, 1874; application file l lJuly c, 1874. 1

To all whom it may concern: y Be it known `that I, YCHARLES T. Lrrcn- FIELD, of Brooklyn, in the'county of Kings and State of New York, have invented an Improved Machine for Cutting and Threading Pipes and Rods, of which the following is a specification:

ratchet, and a pawl, for cutting pipes and rods.

In the accompanying drawing, Figure 1 is a side view, partly in section, of my improved cutting and threading machine. Fig. 2 is a sectional view at right angles to Fig. l. Fig. 3 is a view of the side opposite to that shown in Fig. l. Fig. 4 is a view, partly in section, at right angles to Fig. 2.

A is the base or platform of the machine, in which is arranged a horizontal shaft, B, which carries a bevel-pinion, b X fast on the shaft, and

another pinion, b2, loose on the shaft. The rear side of the pinion bx and the front side of the pinion b2 are provided with teeth or notches,

. forming a clutch. The pinion bX is for engagement with a pinion, cx, on the lower end of a vertical shaft, C, and the pinion b2 for engagement with a wheel, c2, on said shaft C. The power is applied to the shaft B. When the machine is at work the pinion b2 is usually engaged with the wheel c2, but when it is desired to increase the speed, as may be the case when the machine is to be reversed, the shaft B is shifted longitudinally, so as to cause the pinion bc to engage with the pinion cx to drive the shaft G, thus disengaging the clutch and allowing the pinion b2 to revolve independently of the shaft B. On the upper end of the shaft O is a bevel-pinion', c3, (see Figs.2 and 3,) which imparts motion to a bevel-wheel, D. This wheel revolves around aiixed annular bearing, K, and is prevented from lateral displacement by means of plates k 7c, attached to a standard, G, which extends upward from the base or platform A. In some cases the iixed annu lar bearing K may be dispensed with, and the plates 7c k may extend entirely around, as shown in Fig. 4, so as not only to prevent lateral displacement, but also to serve as a bearing for the wheel D. When the xed annular bearing is used, it is formed on or attached to the standard G and is of sufficient diameter to admit pipes and rods of different sizes. On the rear side of the bevel-wheel D is bolted a box, D", for carrying the screw-threading dies dx, which may be removed for the purpose of replacing them with others of different sizes. These dies are fed up to their work by means of a feeding device, E, working'in a bushing, e, which may be held in place in the box DX by a set-screw, ex. When the machine is used forcutting, and not threading, the dies and feeding device are removed from the box DX. In the standard G, on the side opposite the box DX, slides a yoke, H, provided with two centering-jaws, f f2. The lower jaw, f1, is formed on the yoke H, and the upper jaw, f 2, slides in the yoke. (See Fig. 3.) A differential screw, J, engages with a thread in the upper part of the standard Gand another thread in the upper part of the yoke H, the lower end of the screw working loosely in the sliding jaw f2. As the differential screw J is turned, the jaw f 1 is raised and the jaw f2 is depressed, and the two jaws are simultaneously drawn toward each other and toward the center of revolution of the wheel D, by which means the rod or pipe I may be properly centered. The cutting-tool M is attached to one end of the tool-holder L, the other end of which is pivoted to the wheel D, and is provided with a tail-piece Z, for engagement with a snail-cam, N, which is made fast to a ratchet-wheel, l?, attached to the wheel D. A pawl, Q, is attached to the lower one of the plates 7c, so as to engage with the ratchet P at each revolution of the wheel D and partially revolve the ratchet in the direction of the arrow 2, a pawl, s, preventing it from turning backward. The wheel D revolves in the direction of the arrow 3, and when it reaches the position shown in Figs. l and 3, the ratchet strikes the pawl Q and is moved in the direction of the arrow a distance equal to the length of one of its teeth,moving the earn N a corresponding distance and causing it to press upon the end of the tail-piece l and feed the tool M to its work. Thus the tool is fed up at each revolution and caused to cut with a precision and regularity which would be unattainable if fed up gradually and continuously. The pawl Q may be arranged so that it may be moved out of engagement with the ratchet, or the ratchet may have a piece cut from its edge, sothat it may pass clear of the pawl Q when the cutting-tool is not in use. On the wheel D, at a point opposite the edge of the cutting-tool, is an adjustable sliding-rest forholding the work while being cut. This rest consists of a bar, R, one end of which is divided and spread out so as form a bearing for the pipe or rod to be cut. The remaining portion of the bar works between two blocks or plates and is heldin place by a screw, r1, passing through a slot, r2, by which means the bar may be adjusted to correspond with pipes or rods of different sizes and form a bearing therefor while being operated upon by the cutting-tool.

This machine may be used for cutting ining wheel D, the stationary standard G, sus-- taining the bearing for the said Wheel D, the di'erential screw J, yoke H, and centerin g-jaws f1 f2, as shown and described, for the purpose specified.

3. The combination of the cutting-tool M, pivoted tool-holder L, cam N, ratchet P, and pawl Q, as shown and described, for the purpose specified.

4. The Combination of the Standard e, v

plates la 7c, and wheel D, substantially ,as and for the purpose shown and described.

' CEAS. T. LITCHFIELD.

Witnesses MICHAEL RYAN, FRED. HAYNEs. 

